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| year | imports | change |
| 1993 | .20 | NA |
| 1995 | .30 | 50.00% |
| 1996 | .40 | 33.33% |
| 1997 | .60 | 50.00% |
| 1998 | .80 | 33.33% |
| 1999 | .90 | 12.50% |
| 2000 | .80 | -11.11% |
| 2001 | .80 | 0.00% |
| 2002 | 1.00 | 25.00% |
| 2003 | 1.00 | 0.00% |
| 2004 | 1.20 | 20.00% |
| 2005 | 1.30 | 8.33% |
| 2006 | 1.30 | 0.00% |
| 2007 | 1.50 | 15.38% |
| 2008 | 1.70 | 13.33% |
| 2009 | 1.90 | 11.76% |
| 2010 | 1.80 | -5.26% |
| 2011 | 1.80 | 0.00% |
| 2012 | 2.30 | 27.78% |
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